No, no surprise there.
Cops/Sheriffs are not the only corrupt arm of the criminal justice system. The whole system is messed up.
Generally speaking no. Even if it looks really bad and they honestly want to make amends, they wont as doing so may be seen as an admission of wrongdoing either usable in or encouraging of a lawsuit. As a general rule, damage done during the execution of a warrant will not be covered by the police or their insurance provider.
They don't pay a bit. We, on the other hand, pay and don't receive value for our money.
Goddamn it.
The issue though is that it's not the pockets of the guilty. Officers are almost entirely shielded from the legal and financial costs of the damage they do.
When we ask "Why do they behave like that?" the answer is because they can, and there's literally no reason for them not to. They're literally consequence free.
As one example, this happened near me last year: http://www.rawstory.com/2015/06/paramilitary-thugs-colorado-...
In fact, the whole story is a great representation of the concerns expressed in your comment - the PD literally blew up a house to catch a suspected shop lifter.
Edit: Looks like PD offered him $5,000 after the incident, and then he had to take them to federal court. Looks like the court proceedings are still going; how utterly insulting.
http://www.denverpost.com/2016/08/03/homeowner-sues-greenwoo...
And who the hell approved a raid? What happened to two police officers knocking on your door? Why are all suspects considered felons (the only offense class I can conceive of that could deserve a raid) for the purpose of serving a warrant? Do police pay for damages in cases where a raid is excessive force?